USA and Brazil battle for title of top spam-relaying nation

Graham Cluley
@gcluley

Amidst all the hubbub and activities around International Kill-A-Zombie Day on Halloween, and Paul Ducklin determining that there are 80,000 zombies in Australia, one interesting piece of data may have been overlooked.

Every three months Sophos publishes it’s “Dirty dozen” list of top spam-relaying countries. This is an easy way to tell which countries are sending out the most spam from compromised computers (also known as zombies) acting as part of a botnet.

Here’s the latest “Dirty dozen” which we put together at the end of last week, looking at July – September 2009:

Remember that the owners of these computers probably have no idea that their PC (and it usually is a PC, although we do come across compromised Linux and Mac computers too) has been hijacked by a hacker and is silently sending out spam on behalf of…

Read more in my article on the Naked Security website.

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Graham Cluley is a veteran of the anti-virus industry having worked for a number of security companies since the early 1990s when he wrote the first ever version of Dr Solomon's Anti-Virus Toolkit for Windows. Now an independent security analyst, he regularly makes media appearances and is an international public speaker on the topic of computer security, hackers, and online privacy. Follow him on Twitter at @gcluley, or drop him an email.